Receiver for wireless signaling.



N0. 897,779. PATENTEDSEPT. 1, 1908. V. POULSEN.

RECEIVER FOR WIRELESS SIGNALING.

' APILIOATION rmm 11mm, 1907.

IN TERRl/PTE E V (i Eli m m i T i rrn 'swrin u Entree i VALDEMAR POULSEN, OEEOPENILKGEN, DENhiAiti-E.

RECEIVER 330R WIRELESS SXGN'ALKNQ.

Specification of Letters Patent.

viii,

Application filed March. 6, 1997. Serial No. 30,959.

T 0 all whom it may concern:

Be it known that I, VALDEMAR Poursnn, a. subject of the King of Denmark, residing at Copenhagen, Denmark, have invented certainnew end useful Improvements in Re ceivers for Wireless Signaling, of which. the following is it full, clear, and exact description.

This invention relates to a; method and appnratus for wireless signaling by which the energy ziccuniuhitml in the oscillation circuit is periodical! y brought to not on a wave indicator connected to such circuit. By the present invention this is ciiected by pcriodioally putting the oscillation circuit out of resonance with the serial or other circuit towhich it is tuned. The accumulated energy will then at once be caused to not upon the wave indicator.

In the drawing, Figure l. is e diagram illustrating a wireless receiving nppn'rntus enibodying the principics oi inyinvention. Fig. 2 shows it slightly inodilied form of the same.

Referring to 1, aindicntes nrcceiving antenna or ecriel circuit iIOlll which oscillattions are induced in the coil ('1 which, together with the condensers c and d, constitutes a. closed oscillation circuit.

6 designates an ordinary telephone reserver which constitutes u detector or woveindicetor. fit f there is provided an inter inittent contact device which is adapted to con le or connect another condenser k in peralle with the condenser c. When the con-- tact is interrupted :ti, f, assuming that the oscillation circuit is tuned to resonance under these circumstances, intense oscillations Will appear in the said PSttilltthiOIl circuit without passing through the telephone receiver 6, on account of the enormous reectanec of the lat ter to high frequency oscillations. If, new, the the energy :i-ocunrw itself suddenly through the .telephone re eeiver a, which will aocordinglybe actuated. While a full discussion of the theoreticul considerations entering into this last action is impossible in this specification, and also unnecesszir it me he enerell' stutedthat, 7

when the cells a and b are in resonance,

the ducljunce by condenser d is first cherged and then dis-- charged at e. ute corresponding to the ire qucncy oi the oscillations. In othe us, the condenser (1 receives each charge u ith c2;- trenie 'suddenness and almost instnnti' charges itself again through the coil which, being in. resonance, does not oppose such discharge, but actually assists it and maintains the intensity of the oscillations. it, howd receives a charge in this way, the coils it end i) be no longer in resonance, then the di charge of the condenser through the coil 1) would he opposed. its charge w ll therefore have to lind another path, end such path is provided by the tciephone z'ecoivcrc, even although the discharge through this path necessarilytakes at much. longer intervol than an oscillation of the c rcuit. The discharge oi. the condenser d tin-o ceivcr e wouhhoi course, take pint minute fraction of n cond, produci sharp top, notwithstsiniingr the feet the intervni is very considr 'ehly grout periodicity of the osciiisti tion system. According receiving waves, the feet trips in the telephone re civer tect is made zttj, but, if the system not ceiving waves, there will he no tsgsin the phone receiver (2. l

in the diagram shown. .2 trolytic detector is used as s. were 1 The detector is indicated at 5; and the hettery at g. h designates :1 vnrhihlc resistance by means of which the potentiei ucrozs the c teeter may be regulated. The conden. i and d prevent the current from the h ry y from passing; any other trey then through. the detector. I

in the two embodiments oi the invention above described, the capacity of the Uhtiiili tion circuit has been vnricd by means oithe intermittent contact device.

What I claim is:

1. The method of Wireless signaling which consists in iinpelling the energy from a. rescllltllt oscilintion circuit having inductance and i-zt nicity through it detcidor lie-vineiriever, it he assumed that, after the condenser" pcrimlirolly unheluncing or destreying the condition of resonance in said whereny the energy accumulated by reso- 10 circuit. name is caused to discharge itself suddenly 2. A. receiving apparatus for a wireless th ough the detector. telegraph system comprising e circuit in in witness whereof, I subscribe my signer which oscillations are set up, an oscillation ture, in the presence of two witnesses.

circuit in resonance therewith, a detector VALDEMAR POULSEN. having a eomperatively large i'eaotzinoe, and means for uiibelancing or destroying the condition of resonance in said oscillation circuit,

Witnesses:

innen OLAF PEDERSEN, VIGGO Bum. 

